Is it possible to build a custom image with a prebuilt kernel?

[doragasu]

I am building a custom image for rpi4b and everything works great so far. I only want to customize the installed packets and configuration, but I do not need a custom kernel. Since building the kernel is what takes by a wide margin most of the image generation time, I was wondering if there's a way to build the image without building the kernel (using the one from the official builds). I have browsed the documentation and found no way, so maybe it is not supported and building the kernel is mandatory?

[Werner]

If a kernel package exists as artifact in oci cache it will be downloaded and used. Only if there is no artifact it will be built from scratch. After a new kernel version is released it may take a few days until oci catches up.

However once locally built it will also be cached locally so it will be re-used if you start another build.

[doragasu]

Yeah, I noticed it was not rebuilt on the next calls to compile.sh. Might not solve the problem for CI/CD environments, but for development it should work. Thanks!